Question

What is the length of side AB?

4 m

10 m

16 m

8 m

Answer 1

do you know the pythagorean theorem?
a^2 + b^2 = c^2

Answer 2

the c is the longest side. a and b are the "legs"

replace the letters with the lengths they gave you .
what do you get ?

Answer 3

A is 10?

Answer 4

side AC, (the fence) is the longest side. AC is 10 long

in the formula
a^2 + b^2 = c^2

(the most famous formula in math!)
c stands for the longest side.
so replace c with 10

a^2 + b^2 = 10^2

(btw, 10^2 means 10 times 10)

now a and b are the legs (which is which does not matter)
choose a to be the leg you know. what do y replace a with in the formula (what number?)